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Date and Time of the Query: 2019-06-25 T01:20:25 PDT
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For refcode 2005ApJ...631L.129R:
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2005ApJ...631L.129R The Pattern Speeds of 38 Barred Galaxies P. Rautiainen, H. Salo, and E. Laurikainen Abstract. We estimate the pattern speeds of 38 barred galaxies by simulation modeling. We construct the gravitational potentials of the galaxies from near-IR photometry by assuming that the mass-to-light ratio (M/L) is constant in the H band and a single pattern speed dominates in the stellar disk. We use the response of gaseous and stellar particle disks to a rigidly rotating potential to determine the pattern speed. If our assumptions are correct, then the pattern speed depends on the morphological type: the average value of the ratio of the corotation resonance radius to the bar radius, R, increases from about 1.1 in type SB0/a to 1.4 in SBb and 1.7 in SBc. Within the error estimates, all the bars in galaxies of type SBab or earlier are fast rotators, having R<=1.4, whereas late-type galaxies include both fast and slow rotators. Key words: Galaxies: Fundamental Parameters, Galaxies: Kinematics and Dynamics, Galaxies: Structure
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